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The mum explained how last year her son, Kian, who is now eight years old, started getting behaviour reports at school.

He had not had any problems in Kindergarten and was always "intelligent, feisty and extremely active," so Melody was surprised when Kian's teacher told her he was pushing other children and "having a hard time controlling his body."

With new systems in place at school, his behaviour improved - but at home it got worse, with meltdowns over little things.

"Every morning it's tantrum after tantrum, before we even get out of bed," she said. "Hitting and throwing things, and the screaming. All the screaming. Starting at 5am every morning.

"We were at a loss - how did he become this way, what could we have done different?"

The picture Melody shared (Image: Melody Yazdani/Facebook)

The Mirror reports how Kian started to see a therapist, who recommended ADHD testing.

'Lightning struck' when Melody found an article linking ADHD to sleep disordered breathing and mouth breathing.

The red flag in Melody's photograph is that Kian's mouth is open while he sleeps.

She wrote: "CHILDREN SHOULD NOT BREATHE THROUGH THEIR MOUTHS. Not while awake, not while asleep. Never.

"Mouth breathing is NOT NORMAL and has long term consequences for health. I'll repeat, because this is important - MOUTH BREATHING IS NOT NORMAL, NOT DURING THE DAY OR AT NIGHT.

"When a child breathes through their mouth, their brain (and body) is not getting enough oxygen. At night, this lowered oxygen saturation is detrimental to the quality of sleep and their brain's ability to get enough rest."